Alert archive / Iowa / Tornado Warnings in 2018
Tornado Warning 5, NWS Quad Cities, IA
NWS Quad Cities, IA issued this tornado warning at May 2, 2018, 7:51 PM CDT for Cedar County, Johnson County, Muscatine County, Iowa. It was in force for 20 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 2, 2018, 7:51 PM CDT (00:51 UTC)
- Expired
- May 2, 2018, 8:11 PM CDT
- In force
- 20 min
- Issued by
- NWS Quad Cities, IA
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.5 in
Counties Cedar County, IA, Johnson County, IA, Muscatine County, IA
The radar
The Quad Cities radar (KDVN), 72 km from the middle of the area, began a volume at 00:51 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 2, 7:59 PM CDT | TSTM WND GST 60 | Hills, IA | |
| May 2, 8:00 PM CDT | HAIL 0.75 | Hills, IA | |
| May 2, 8:14 PM CDT | HAIL 0.88 | 2 Se Iowa City, IA | PENNY TO NICKLE SIZE HAIL |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 2, 3:56 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.9 hours before the alert went out and 78 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1023 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 1402 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 184 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 5.1
The text
As transmitted.
899
WFUS53 KDVN 030051
TORDVN
IAC031-103-139-030145-
/O.NEW.KDVN.TO.W.0005.180503T0051Z-180503T0145Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
751 PM CDT WED MAY 2 2018
The National Weather Service in the Quad Cities has issued a
* Tornado Warning for...
Southwestern Cedar County in east central Iowa...
Southeastern Johnson County in east central Iowa...
Northwestern Muscatine County in east central Iowa...
* Until 845 PM CDT
* At 750 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Hills, or 8 miles southwest of Iowa City, moving
east at 25 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
University Heights around 800 PM CDT.
Hills around 805 PM CDT.
Iowa City around 810 PM CDT.
West Branch around 830 PM CDT.
West Liberty around 840 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Springdale, Cedar Valley, Iowa City Municipal Airport, Herbert Hoover
National Historic Site, Muscatine County Fairgrounds, Johnson County
Fairgrounds, University Of Iowa, Hills Access and Oasis.
This includes Interstate 80 in Iowa between mile markers 248 and 260.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4175 9125 4148 9121 4150 9152 4151 9153
4151 9165 4163 9168
TIME...MOT...LOC 0050Z 256DEG 20KT 4156 9162
TORNADO...RADAR INDICATED
HAIL...1.50IN
$$
ERVIN2 follow-up statements
478
WWUS53 KDVN 030100
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
800 PM CDT WED MAY 2 2018
IAC031-103-139-030145-
/O.CON.KDVN.TO.W.0005.000000T0000Z-180503T0145Z/
Cedar IA-Johnson IA-Muscatine IA-
800 PM CDT WED MAY 2 2018
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR
SOUTHWESTERN CEDAR...SOUTHEASTERN JOHNSON AND NORTHWESTERN MUSCATINE
COUNTIES...
At 759 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Hills, or 7 miles south of Iowa City, moving east at
25 mph.
HAZARD...Tornado and ping pong ball size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This dangerous storm will be near...
West Branch around 825 PM CDT.
West Liberty around 835 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Springdale, Iowa City Municipal Airport, Herbert Hoover National
Historic Site, Hills Access, Muscatine County Fairgrounds and Johnson
County Fairgrounds.
This includes Interstate 80 in Iowa between mile markers 251 and 260.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4171 9125 4148 9121 4150 9152 4151 9153
4151 9165 4161 9166
TIME...MOT...LOC 0059Z 264DEG 22KT 4155 9152
TORNADO...RADAR INDICATED
HAIL...1.50IN
$$
ERVIN343
WWUS53 KDVN 030111 RRA
SVSDVN
Severe Weather Statement
National Weather Service Quad Cities IA/IL
811 PM CDT WED MAY 2 2018
IAC031-103-139-030119-
/O.CAN.KDVN.TO.W.0005.000000T0000Z-180503T0145Z/
Cedar IA-Johnson IA-Muscatine IA-
811 PM CDT WED MAY 2 2018
...THE TORNADO WARNING FOR SOUTHWESTERN CEDAR...SOUTHEASTERN JOHNSON
AND NORTHWESTERN MUSCATINE COUNTIES IS CANCELLED...
The tornadic thunderstorm which prompted the warning has
weakened. Therefore, the warning has been cancelled. However large
hail, damaging winds and heavy rain are still possible with this
thunderstorm.
A severe thunderstorm watch remains in effect until 1100 PM CDT for
southeastern and east central Iowa.
Remember, a Severe Thunderstorm Warning still remains in effect for
southern Johnson County.
LAT...LON 4171 9125 4148 9121 4150 9152 4151 9153
4151 9165 4161 9166
TIME...MOT...LOC 0107Z 256DEG 20KT 4156 9145
$$
ERVINThe office that day
Everything else NWS Quad Cities, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 7:18 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Johnson, Washington | 57 min |
| May 2, 7:24 PM CDT | Tornado Warning | DVN | Johnson, Washington | 51 min |
| May 2, 7:51 PM CDT | Severe Thunderstorm Warning | DVN | Scott | 39 min |
| May 2, 7:58 PM CDT | Severe Thunderstorm Warning | DVN | Keokuk, Washington | 29 min |
| May 2, 8:07 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Johnson, Muscatine | 53 min |
| May 2, 8:19 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Dubuque | 36 min |
| May 2, 8:34 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Clinton, Scott | 27 min |
| May 2, 9:51 PM CDT | Special Weather Statement | DVN | Scott | 24 min |
| May 2, 10:18 PM CDT | Special Weather Statement | DVN | Scott | 87 min |
| May 2, 11:40 PM CDT | Special Weather Statement | DVN | Lee, Van Buren | 50 min |
| May 3, 10:39 AM CDT | River Flood Warning | DVN | Clinton, Scott | 24 hr |
| May 3, 11:15 AM CDT | River Flood Watch | DVN | Jackson | 11 hr |
| May 3, 11:15 AM CDT | River Flood Watch | DVN | Lee | 7 days |
| May 3, 2:51 PM CDT | Special Weather Statement | DVN | Buchanan | 39 min |
Nearby
Tornado Warnings in Iowa, 2018Every tornado warning in 2018Tornadoes in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.